Now to the growing flu epidemic. Two deaths already. A 29-year-old mother of three died on monday and a 41-year-old father of six passing away from what doctors believe was the h1n1 virus. Abc news health and medical editor dr. Richard besser is here on this deadly strain. We think of the families who lost their loved ones. They were young and had no underlying health issues. So incredibly sad. You know, it's very hard to predict who is going to have a bad case of flu. Usually it's the young and elderly but here you had someone who was sick since christmas. Someone sick for just five days and they were young and you have to ask why people in this age group, there's a couple possibilities, healthy young adults in the past have been less likely to get the flu vaccine and for the past five years it's included protection against h1n1. Not complete but some. People who are older and born in 1950 or earlier were exposed to some strains of flu that may give them some protection to this strain out there now. How do you know, rich, if you have this particular strain of the flu? This year, 97% of all the flu that's out there right now is the h1n1 train. If you have the flu that's what you've got so we've talked about the symptom, typical cold symptoms but a cough, high fever, body ache, that is the flu. High risk, call your doctor. 37 states now where it's high. It is all over the place. So, you know, we've talked about how to prevent this and how to protect yourself. Get the flu shot, wash your hands, you want to make sure -- elbow -- not even this. Elbows is the best way. It will reduce your chances of getting it. It's the way to go. Okay, rich, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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